Peel sweet potatoes and slice into 1/2 inch rounds. If your sweet potatoes are large, halve or quarter the rounds. Parboil for 8 to 10 minutes.
Combine remaining ingredients in a sauce pan. Cook, stirring until thickened.
Arrange sweet potato slices in a baking dish and pour sauce over them. Cover and bake at 350 degrees for 20 minutes. Uncover, bake 15 minutes longer. Makes 4 to 6 servings.